Alarm-lock.



G. G. TUGH.

ALARM LOCK.

APPLICATION FILED OUT. a, 1913.

Patented June 16,1914.

Allllh} O I O \9 J\ I la 4- 6' 3 & O I 7 G awe/M01 wiwmco v COLUMBIAPLANOGRAPH c0., WASHINGTON, n. c.

UNITED STATES PATENT QFFICE.

CHRISTIAN CARL TUCH, OF HONOLULU, TERRITURY OF HAWAII.

ALARM-LOCK.

To all whom it may] concern Be it known that I, CHRISTIAN C. TUCH, acitizen of the United States, residing at Honolulu, in the county ofHonolulu and Territory of Hawaii, have invented new and usefulImprovements in Alarm-Locks, of which the following is a specification.

This invention relates to improvements in alarm locks and has particularapplication to a door lock wherein the sliding of the bolt to unlockingposition will automatically close an electric circuit to sound an alarm.

In carrying out the present invention, it is my purpose to provide alock of the class described wherein the contacts forming the terminalsor" the electric circuit will rest upon the locking bolt and hold thelatter seated within the casing, such contacts performing the dualfunction of contacts and holding springs.

It is also my purpose to provide a device of the class described whichwill embrace the desired features of simplicity, efiiciency anddurability and one which may be installed and maintained at a minimumexense.

lVith the above and other objects in view, the invention consists in theconstruction, combination and arrangement of parts hereinafter set forthin and falling within the scope of the claims.

In the accompanying drawing; the figure is a vertical central sectionalview through a door lock constructed in accordance with my presentinvention.

Referring now to the accompanying drawing in detail, the numeral 1designates a casing having a slot 2 formed in one end wall thereof.Mounted within the casing and seated upon the lower wall thereof areblocks 3, 3 constituting a seat for the locking bolt 4:, the latterbeing capable of sliding movement within the casing upon the seat formedby the blocks 3, 3 and adapted when in locking position to be projectedout of the opening 2 so as to engage the keeper.

In the present instance, the under surface of the locking bolt 4adjacent to one end thereof is formed with a series of transversegrooves 5 suitably spaced apart and adapted to interchangeably receiveribs 6 formed on the upper surface of the adjacent block 8. The sidewall of the casing is formed with a keyhole 7 disposed in a plane belowthe under surface of the locking bolt,

Specification of Letters Patent.

Application filed October 3, 1913.

Patented June 1 5, 1914.

Serial No. 793,245.

while such surface of the bolt adjacent to the keyhole is formed with agroove 8. By means of this construction, it will be seen that when thekey is inserted in the keyhole and rotated, the wing thereon will engagein the groove 8 and in the turning movement of the key the grooved endof the locking bolt will be lifted so as to relieve the bolt of theinfluence of the ribs 6, 6 whereby the bolt will be slid to lockingposition in the continued turning movement of the key. When the bolt isrelieved of the influence 0f the key, the grooved end thereof againreseats upon the respective block and the ribs 6, 6 on such blockreenter the grooves 5, 5 so as to retain the locking bolt in activeposition.

Suitably fastened to the opposite end walls of the casing 1 are springcontact fingers 9, 9 having the lower ends thereof curved upwardly as at10 and bearing upon the upper surface of the locking bolt 4:, while theupper surface of the latter, at a point approximately centrally thereof,is provided with a metallic insert 11 of conducting material, theremaining portion of the upper edge of the bolt being covered withinsulating material. The fingers 9, 9 are connected to the oppositeterminals of an electric circuit 12 including a suitable source ofelectrical energ Y and an audible signal such, for instance, as a bell13.

From the foregoing description taken in connection with the accompanyingdrawings, the construction, mode of operation and manner of employing myinvention will be readily apparent. When the bolt 4 is in lockingposition, as illustrated in the drawing, the metal insert 11 in theupper surface of the bolt engages the lower end of one of the fingersand is out of engagement with the lower end of the other finger so thatthe electric circuit 12 is broken. On the other hand, when the bolt isretracted, the metallic insert 11 bridges the lower ends of the contactfingers 9 and so closes the circuit 12 whereby the alarm 13 is soundedto ad vise the occupants in the structure in which {he device isinstalled of the opening of the ock.

It will be seen that I have provided an alarm lock wherein the contactfingers form ing the terminals of the electric circuit perform thetwo-fold function of terminals and sprin s so as to maintain the lockingbolt seated and restore the same to engagement with its seat subsequentto the actuation of the bolt by the key.

I claim:

1. In a door look, a casing, a locking bolt seated within said casingand adapted for sliding movement therein, a metallic insert in the upperedge of said bolt, and spring contact fingers secured to the oppositeends of said casing and bearing upon the upper edge of the bolt andadapted to hold the bolt seated and close an electric circuit whenbridged by said insert.

2. In a door lock, a casing, blocks mounted upon the bottom wall of saidcasing and forming a seat, transverse ribs upon the upper surface of oneof said blocks, a locking bolt seated upon said blocks and capable ofsliding movement thereon and having transverse grooves formed in theunder surface thereof adapted to receive said ribs, spring contactfingers carried by the opposite end walls of said casing and bearingupon the upper surface of sald bolt and forming the terminals of anelectric circuit, and a metallic casing in the top edge of said bolt andadapted to bridge said fingers when the bolt is in unlocked position.

In testimony whereof I aflix my signature in presence of two witnesses.

CHRISTIAN CARL TUCH.

Witnesses CARMEN VIDA, FRANK J. PRUGER.

Copies of this patent may be obtained for five cents each, by addressingthe "Commissioner of Patent, Washington, D. C.

